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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c96ad832c6aea4281248f9c7071869e970d97baf0ba4478ea2b7aaad1a2a9567' 
  AND token = 'NVkfeevLXxLhEBmtLts+kLdM4+z5MxWbNEEhlALBPb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}